ST10F269ZX datasheet(151/184 Pages) STMICROELECTRONICS

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ST10F269

151/184

VDD = 5V ± 10%, VSS = 0V, TA = -40 to +125 °C (TQFP144 devices)

1. Theoretical minimum. The real minimum value depends on the duty cycle of the input clock signal. 32MHz is the maximum input frequency

when using an external crystal oscillator. However, 32MHz can be applied with an external clock source.

2. The input clock signal must reach the defined levels VIL and VIH2.

Figure 70 : External Clock Drive XTAL1

21.4.9 - Memory Cycle Variables

The tables below use three variables which are derived from the BUSCONx registers and represent the

special characteristics of the programmed memory cycle. The following table describes, how these

variables are to be computed.

Parameter

Symbol

fCPU = fXTAL

fCPU = fXTAL / 2

fCPU = fXTAL x F

F = 1.5/2,/2.5/3/4/5

Unit

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Oscillator period

tOSC SR

31.251

–

15.625

–

31.25 x N

–

High time

12.52

–6.252

–

12.52

–

Low time

12.52

–6.252

–

12.52

–

Rise time

–

3.1252

–1.562

–3.1252

Fall time

–

3.1252

–1.562

–3.1252

Description

Symbol

Values

ALE Extension

TCL x [ALECTL]

Memory Cycle Time wait states

2TCL x (15 - [MCTC])

Memory Tri-state Time

2TCL x (1 - [MTTC])

VIL

tOSC

VIH2

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